Convert __OwningControllerFD to a 64-bit value

This lets us potentially use it for internal passing of windows
sockets.

src/app/config/config.c

@@ -260,6 +260,9 @@ DUMMY_TYPECHECK_INSTANCE(or_options_t);
   VAR(#member, LINELIST_S, member ## _lines, NULL),             \
   VAR("__" #member, LINELIST_S, member ## _lines, NULL)
 
+/** UINT64_MAX as a decimal string */
+#define UINT64_MAX_STRING "18446744073709551615"
+
 /** Array of configuration options.  Until we disallow nonstandard
  * abbreviations, order is significant, since the first matching option will
  * be chosen first.
@@ -647,7 +650,7 @@ static config_var_t option_vars_[] = {
   VAR("__HashedControlSessionPassword", LINELIST, HashedControlSessionPassword,
       NULL),
   VAR("__OwningControllerProcess",STRING,OwningControllerProcess, NULL),
-  VAR("__OwningControllerFD",INT,OwningControllerFD, "-1"),
+  VAR("__OwningControllerFD", UINT64, OwningControllerFD, UINT64_MAX_STRING),
   V(MinUptimeHidServDirectoryV2, INTERVAL, "96 hours"),
   V(TestingServerDownloadInitialDelay, CSV_INTERVAL, "0"),
   V(TestingClientDownloadInitialDelay, CSV_INTERVAL, "0"),
@@ -1948,12 +1951,8 @@ options_act(const or_options_t *old_options)
     // LCOV_EXCL_STOP
   }
 
-  if (running_tor && !old_options && options->OwningControllerFD != -1) {
+  if (running_tor && !old_options &&
-#ifdef _WIN32
+      options->OwningControllerFD != UINT64_MAX) {
-    log_warn(LD_CONFIG, "OwningControllerFD is not supported on Windows. "
-             "If you need it, tell the Tor developers.");
-    return -1;
-#else
     const unsigned ctrl_flags =
       CC_LOCAL_FD_IS_OWNER |
       CC_LOCAL_FD_IS_AUTHENTICATED;
@@ -1963,7 +1962,6 @@ options_act(const or_options_t *old_options)
                "given FD.");
       return -1;
     }
-#endif /* defined(_WIN32) */
   }
 
   /* Load state */
@@ -8197,6 +8195,7 @@ getinfo_helper_config(control_connection_t *conn,
         case CONFIG_TYPE_STRING: type = "String"; break;
         case CONFIG_TYPE_FILENAME: type = "Filename"; break;
         case CONFIG_TYPE_UINT: type = "Integer"; break;
+        case CONFIG_TYPE_UINT64: type = "Integer"; break;
         case CONFIG_TYPE_INT: type = "SignedInteger"; break;
         case CONFIG_TYPE_PORT: type = "Port"; break;
         case CONFIG_TYPE_INTERVAL: type = "TimeInterval"; break;

src/app/config/confparse.c

@@ -195,6 +195,19 @@ config_assign_value(const config_format_t *fmt, void *options,
     *(int *)lvalue = i;
     break;
 
+  case CONFIG_TYPE_UINT64: {
+    uint64_t u64 = tor_parse_uint64(c->value, 10,
+                                    0, UINT64_MAX, &ok, NULL);
+    if (!ok) {
+      tor_asprintf(msg,
+          "uint64 keyword '%s %s' is malformed or out of bounds.",
+          c->key, c->value);
+      return -1;
+    }
+    *(uint64_t *)lvalue = u64;
+    break;
+  }
+
   case CONFIG_TYPE_CSV_INTERVAL: {
     /* We used to have entire smartlists here.  But now that all of our
      * download schedules use exponential backoff, only the first part
@@ -574,6 +587,7 @@ config_get_assigned_option(const config_format_t *fmt, const void *options,
       tor_asprintf(&result->value, "%d", *(int*)value);
       escape_val = 0; /* Can't need escape. */
       break;
+    case CONFIG_TYPE_UINT64: /* Fall through */
     case CONFIG_TYPE_MEMUNIT:
       tor_asprintf(&result->value, "%"PRIu64,
                    (*(uint64_t*)value));
@@ -781,6 +795,7 @@ config_clear(const config_format_t *fmt, void *options,
     case CONFIG_TYPE_AUTOBOOL:
       *(int*)lvalue = -1;
       break;
+    case CONFIG_TYPE_UINT64:
     case CONFIG_TYPE_MEMUNIT:
       *(uint64_t*)lvalue = 0;
       break;

src/app/config/confparse.h

@@ -19,6 +19,7 @@ typedef enum config_type_t {
   CONFIG_TYPE_FILENAME,     /**< A filename: some prefixes get expanded. */
   CONFIG_TYPE_UINT,         /**< A non-negative integer less than MAX_INT */
   CONFIG_TYPE_INT,          /**< Any integer. */
+  CONFIG_TYPE_UINT64,       /**< A value in range 0..UINT64_MAX */
   CONFIG_TYPE_PORT,         /**< A port from 1...65535, 0 for "not set", or
                              * "auto".  */
   CONFIG_TYPE_INTERVAL,     /**< A number of seconds, with optional units*/
@@ -60,6 +61,7 @@ typedef union {
               * "UINT", it still uses the C int type -- it just enforces that
               * the values are in range [0,INT_MAX].
               */
+  uint64_t *UINT64;
   int *INT;
   int *PORT;
   int *INTERVAL;

src/app/config/or_options_st.h

@@ -514,7 +514,7 @@ struct or_options_t {
    * instance.  Tor will terminate if its owning controller does. */
   char *OwningControllerProcess;
   /** FD specifier for a controller that owns this Tor instance. */
-  int OwningControllerFD;
+  uint64_t OwningControllerFD;
 
   int ShutdownWaitLength; /**< When we get a SIGINT and we're a server, how
                            * long do we wait before exiting? */